From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A272F1F03C5; Sun, 12 Oct 2025 18:49:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760294982; cv=none; b=n1MwvcGGwEeFrnYXBSCLWalvgq4SzxBjXyykDqBYWeFIeWGpemUstPdD3WNbkgUqERZvqdZoXHRD5UYQjElCwxt2NE6rxK/bgna2NDch2Dm0ezGQP1PXrlONDVKgCfH4pBwjJcQbMdAGFxWZqvKFN4Hv28d8c0BjB6QQRnLznzI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760294982; c=relaxed/simple; bh=RUgUVTSYsYM7Mbc5/BDg/R/tHhIfD8bMIgJyaSDzwTM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=krl13os+/cUUAv3xBNH7NbRCwDQOrMdm4adrFmlZR19c3DXwxgf01PaS2DErUC5Ef8FsbRRyGrbk38S+Wfn3L7ikaW/Olh4YznYe+d6KRJJFpn2ocx8AEF8ScWnWXJIH1A/jOsvpPUCgFUZEmSz6yag1jJt1kdxxSm7sBtJ8xW8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ed0RcegT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ed0RcegT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7B256C4CEE7; Sun, 12 Oct 2025 18:49:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760294982; bh=RUgUVTSYsYM7Mbc5/BDg/R/tHhIfD8bMIgJyaSDzwTM=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=ed0RcegTtJi8PPiKQCudFEj1Qcx4LBSv75+OG/DZR4Pmgttb3MREyqU6zuG0XpdJg /yf4F9ucc8L/YROpTOgXlYn12GdRqK1J/ROaYDLiTuwJPirmu8KTArYyDd4p3xpsQ1 ZD+G0MkJwYYqkqBxNWoyhkwZ8DR3PiwSDvuo3NJlMEqT117i7Lnf/dJQpYm+3Y8aM4 1yb3khNJrezl8ozhhtugZLmNk/SYepK8EAGk4ILNrhTKLpppR8blKTJzy2mhG6p+PV sqX64rpcY04UrmA5Spm/mAIEK8sVzyXCiSQU8+ZMLoJFLm5oG8EmCjoJbXSm+a3khU ozqwNFJ51dZnw== Message-ID: Subject: Re: [PATCH] nfsd: Use MD5 library instead of crypto_shash From: Jeff Layton To: Eric Biggers Cc: linux-nfs@vger.kernel.org, Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Date: Sun, 12 Oct 2025 14:49:40 -0400 In-Reply-To: <20251012170018.GA1609@sol> References: <20251011185225.155625-1-ebiggers@kernel.org> <582606e8b6699aeacae8ae4dcf9f990b4c0b5210.camel@kernel.org> <20251012170018.GA1609@sol> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Sun, 2025-10-12 at 10:00 -0700, Eric Biggers wrote: > On Sun, Oct 12, 2025 at 07:12:26AM -0400, Jeff Layton wrote: > > On Sat, 2025-10-11 at 11:52 -0700, Eric Biggers wrote: > > > Update NFSD's support for "legacy client tracking" (which uses MD5) t= o > > > use the MD5 library instead of crypto_shash. This has several benefi= ts: > > >=20 > > > - Simpler code. Notably, much of the error-handling code is no longe= r > > > needed, since the library functions can't fail. > > >=20 > > > - Improved performance due to reduced overhead. A microbenchmark of > > > nfs4_make_rec_clidname() shows a speedup from 1455 cycles to 425. > > >=20 > > > - The MD5 code can now safely be built as a loadable module when nfsd= is > > > built as a loadable module. (Previously, nfsd forced the MD5 code = to > > > built-in, presumably to work around the unreliablity of the name-ba= sed > > > loading.) Thus, select MD5 from the tristate option NFSD if > > > NFSD_LEGACY_CLIENT_TRACKING, instead of from the bool option NFSD_V= 4. > > >=20 > > > To preserve the existing behavior of legacy client tracking support > > > being disabled when the kernel is booted with "fips=3D1", make > > > nfsd4_legacy_tracking_init() return an error if fips_enabled. I don'= t > > > know if this is truly needed, but it preserves the existing behavior. > > >=20 > >=20 > > FIPS is pretty draconian about algorithms, AIUI. We're not using MD5 in > > a cryptographically significant way here, but the FIPS gods won't bless > > a kernel that uses MD5 at all, so I think it is needed. >=20 > If it's not being used for a security purpose, then I think you can just > drop the fips_enabled check. People are used to the old API where MD5 > was always forbidden when fips_enabled, but it doesn't actually need to > be that strict. For this patch I wasn't certain about the use case > though, so I just opted to preserve the existing behavior for now. A > follow-on patch to remove the check could make sense. >=20 This is all legacy code anyway. We just recently flipped the default for CONFIG_NFSD_LEGACY_CLIENT_TRACKING to 'n', so I'm hoping that in a year or so we should be able to just remove it altogether. --=20 Jeff Layton